COVENTRY, Conn. (WTNH) — On his way to North Carolina, Daniel the emotional support duck gained some fans. It’s one of several animals now allowed on planes to support passengers struggling with issues like PTSD.

“We have seen service monkeys, even comfort pigs,” said TSA spokesperson Mike McCarthy.

It’s up to the airline what they will allow when it comes to comfort animals. A note from a doctor is required.

The Transportation Safety Administration has seen plenty pass through security checkpoints.

“There really isn’t much that would surprise our officers,” said McCarthy.

Not even a pig flying. It happened recently at Logan Airport in Boston.

“Right now it’s out of control,’ said Terri Carpenter.

Terri Carpenter has been bringing her therapy dog Mia to schools, hospitals and other locations across Connecticut for years. They work as a team. Mia is trained and registered, something comfort pets may lack.

“I see the comfort animals as something that could really become an issue, if something were to happen with an untrained animal,” said Carpenter.

She believes dogs and animals properly trained and registered can have tremendous value in helping others, as long as that helpful intent is maintained.